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Old 11-04-2014, 09:38 AM   #21 (permalink)
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Geo XL1 - '94 Geo Metro
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Do you have a vacuum gauge...???

A vacuum gauge is also a sort of fuel mileage indicator; when vacuum is low, you are burning more fuel. High vacuum = better mpg.

Simple and cheap...


You can also use it to diagnose engine problems.

AutoSpeed - Using a Vacuum Gauge for Engine Diagnostics


Just enter "vacuum gauge" in the ecomodder search engine for more info.




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Old 11-04-2014, 09:50 AM   #22 (permalink)
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I have one on my Amazon wishlist.

Though I thought it worked the opposite way. The more vacuum would mean the more air the engine was trying to pull, meaning the more fuel and the more speed.
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